Why Won’t My Furnace Turn Off?

why wont my furnace turn off

Furnaces have long been a dependable source of warmth for homeowners. Despite their steadfast performance, these systems can encounter occasional issues. One prevalent heating dilemma is an unyielding furnace won’t turn off when needed. To assist you in discerning the right time to enlist the expertise of your trusted local HVAC service provider, like R.F. Ohl, we delve into the typical triggers and remedies for a furnace that remains tirelessly active.

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Furnace Won’t Turn Off: Causes & Solutions

Let’s delve deeper into the potential causes and solutions for this common heating system issue, a furnace won’t turn off. Ensuring your home stays comfortable while optimizing energy efficiency is essential.


image of homeowner adjusting thermostat

One common culprit behind a furnace that refuses to power down can be as straightforward as a thermostat issue. Specifically, it may be set to the “ON” position instead of “AUTO.” In such cases, you can easily rectify the situation by adjusting the switch to the “AUTO” setting, allowing the furnace to cycle on and off as needed.

Temperature Settings

If your thermostat is set too high, it can cause your furnace to run continuously, leading to higher energy bills and potential discomfort. A setting above 75 degrees often isn’t needed. Finding a balance between comfort and efficiency is essential for an optimally functioning furnace.

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Thermostat Wiring

Wiring wear or damage from pests can cause thermostat malfunctions, potentially stopping a furnace from turning off. Professional HVAC technicians should inspect the wiring for any hidden issues to ensure functionality.

DIY fixes on thermostat wiring are ill-advised due to the high risks of damage and safety hazards, as they’re connected to the home’s electrical system.

Tampering with thermostat wiring without proper knowledge can lead to electric shocks or more severe outcomes. Safety and system integrity could be compromised.

To prevent damage and maintain home comfort and safety, always seek professional help for thermostat wiring issues, avoiding DIY risks and ensuring reliable operation.

Air Filters

image of a furnace filter replacement for heating system efficiency

To prevent your furnace from overworking and using too much energy, regularly change the air filter, calling on HVAC specialists like R.F. Ohl if the task is challenging.

Ensure you use the correct size air filter for optimal airflow and filtration, which an HVAC provider can confirm, to maintain a healthy indoor environment and extend your furnace’s service life.

Furnace Relay Switch

If your furnace won’t turn off, the issue may be with the relay switch, which might need resetting or replacing by an HVAC technician to ensure proper function.

Problems like arc welding and pitting on relay switch contacts can also cause continuous furnace operation, identifiable by sparks, and require immediate professional attention for safe and efficient furnace use.

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Furnace Gas Valve

If your furnace’s gas valve sticks, it may continue to burn fuel and circulate heat non-stop, leading to overheated spaces in your home.

A stuck valve coupled with a gas leak is especially dangerous, raising fire and explosion risks and the chance of carbon monoxide poisoning. Promptly calling an HVAC technician is critical for safety and to prevent elevated gas bills and potential disasters.

Leaky Air Ducts

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Leaky ducts can cause uneven heating and increase dust in your home, leading to discomfort and a dirty indoor atmosphere.

Surges in energy bills often signal leaky ducts, which make your furnace work harder to maintain desired temperatures.

Duct leaks might result from improper sizing or damage from pests, leading to inefficiency and potential home comfort issues.

For resolving ductwork issues and ensuring a comfortable, energy-efficient home, it’s recommended to seek a thorough inspection from an HVAC specialist like R.F. Ohl.

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Reducing Common Furnace Problems

It’s vital to take the following steps to diminish the occurrence of typical furnace issues. Hiring a qualified HVAC professional to carry out these tasks is not only essential for their proper execution but also to maintain your warranty intact. All maintenance and repair services must strictly adhere to the manufacturer’s instructions specified in the product warranty. HVAC professionals are trained to perform these tasks correctly and efficiently, ensuring your furnace operates smoothly.

Annual Heating Maintenance Services

Carrier heating system tune-up

A technician conducts comprehensive inspections and tests on all components of your heating system. This proactive approach helps identify any existing problems, allowing for timely repairs. When your system shows signs of aging, the HVAC professional may recommend upgrading to a more energy-efficient heating system.

During the HVAC tune-up, technicians meticulously clean your furnace, removing all accumulated dust and debris from its components. This cleaning ensures a fresh and unobstructed system. Addressing ductwork cleaning is another crucial step, eliminating debris from your ducts, registers, and vents, which can improve indoor air quality significantly.

Seasonal cleaning services encompass air filter maintenance. Service providers replace the air filter and clear any surrounding debris. They will also verify the correct air filter size and provide guidance on how frequently you should replace it.

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Swiftly Addressing Heating Concerns

When you detect any furnace issues, contact your trusted heating service provider promptly. Addressing problems promptly lessens your heating system’s wear and tear, helping preserve its longevity. By intervening early, you prevent other components from succumbing prematurely to the strain of a malfunctioning furnace.

Timely heating inspections and repairs can save you time and money in the long run. Proactive maintenance is often more cost-effective than addressing a full-blown furnace breakdown or extensive repairs.


Constantly running furnaces pose numerous challenges for homeowners, including elevated heating costs. Various issues can prevent a furnace from shutting down as expected, and these issues should not be ignored. Contacting an HVAC professional at the first sign of trouble allows for swift resolution, ensuring your furnace operates efficiently and economically.

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Call R.F. Ohl For Your HVAC Requirements

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For all your HVAC needs, turn to R.F. Ohl, your premier provider of heating and cooling services in Poconos and Lehigh Valley, Pennsylvania. Our commitment to excellence is reflected in our team of certified technicians who excel in HVAC tune-ups, repairs, installations, and replacements. With their expertise, your HVAC system is in capable hands.

At R.F. Ohl, we take pride in offering the most affordable HVAC service rates in the region. Our maintenance services can help enhance comfort, boost energy efficiency, and lower energy expenses. Should you require an HVAC repair or a replacement system, we’ll guide you to the best solution for your home, all while keeping your budget in mind. Our work is backed by a satisfaction guarantee to provide peace of mind.

Don’t hesitate to reach out to R.F. Ohl today to schedule a service appointment. We’re pleased to offer free, in-home estimates and are ready to address all your HVAC requirements.

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